Aloha Jim & Friends,
I really like the dimensions of those panels. Very Attractive looking. But to me, there are way too many reflective surfaces there: plywood faces & wooden frames are actually the antithesis of what we're trying to do with home & studio treatment, right? Despite all the pukas for foam.
I'd make your own DIY Owens-Corning OC 703 4"x2'x4' broadband absorbers a la Fran Guidry - without all the hard surfaces. You can make them in any dimension. They really work well for my purposes. No frames either. And mine are portable & free-standing so I can place them where needed.
http://www.homebrewedmusic.com/2009/...-on-the-cheap/
My absorbers are also strategically placed around & above my mixing/mastering desk & also in the corners of the room as bass traps. All this for simple acoustic recordings - Ha! It's simple & relatively cheap compared to GIF or the panels in the picture.
Metering the room will tell you everything about where the trouble reflections are & where treatment should be placed.
Most home player/recordists freak out about how to make Room Treatment, where to place it, thinking it must be permanent or expensive, or worse, only think about it when they can't get consistency in their recordings. However, Room Treatment is absolutely necessary for just about all mic recording & is actually quite easy to do cheaply.
Of course, much depends on what you're trying to sonically achieve as well & what works in your space, budget & interest in DIY. I can get audible sonic differences in my recordings by varying the spacing of my free-standing absorbers to allow more or less room in my tracking area, depending on what I want to hear. I never achieved consistent recording results (after 35+ years of trying) until I made the full commitment to Room Treatment & learned how to use it about 15 years ago.
Just my opinions, Jim.
A Hui Hou & Good Luck, Jim!
alohachris